Its a scientific institute Polish Academy of Sciences (PASIFIC) that has officially classified cats as an "invasive alien species," according to the Associated Press.
The study, headed by PASIFIC biologist Wojciech Solarz, found that the damage that cats cause in terms of hunting and killing birds and other wildlife was enough justification to consider the animals invasive.
Just keep your cats indoors, then no problems!
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loginI let my cat go out into the fenced off backyard sometimes and the only creature he has ever been able to capture out there is a lizard.